A combination of Ga (crazy; from Ga in Gaga), ba (making weird noises), and ha (laughing) in one to create a laugh that is known as hard to breathe and can be contagios.
Can be pronouced "gabaha" while laughing or used in online conversations.
*someone says something funny*
You: GABAHA!!!, gabaha (in an online conversation), or HAHAHAHAHAHAHHAHA! (uncontrollably, breathlessly, and contagiously, which would make all those ha's one gabaha)